What a coincidence. I have exactly the same problem with the same model. Ours is nearly 6 years old. I have not been able to find this fault on a number of other forums.
The last few washes seem to have been getting longer and we stopped the last wash at 5 hours.
I have cleaned out filters and washer arms.
Just about to check out the waste drain and try a reset. Will let you know if it sorts it.
Godfrey Tucker
January 2010